how can i select a random number from a column of a matrix? and then how to find the location of that number?

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I have a matrix (4x3) and I need to select a value from second column and find the corresponding row number.
For example, A = [11 24 31; 18 19 27; 16 21 34; 23 37 33 28]
Could someone help me?

回答 (1 件)

Iddo Weiner
Iddo Weiner 2018 年 4 月 1 日
If you use a random number to index the row you want to extract, you will already have what you need:
A = randi(10,[4,3]);
rand_row = randi(size(A,1)) %get random row
rand_number = A(rand_row,2) %get your rand number form the 2nd column
  5 件のコメント
Guillaume 2018 年 4 月 3 日
Choosing a random number from the 2nd column and getting the corresponding row is exactly equivalent to choosing a random row and getting the corresponding number in the 2nd column. Iddo showed you how to do the latter, so again you'll have to explain why it didn't work for you.


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